The heat wave that struck Europe in July 2026 severely affected chick nutrition, reducing feed intake, growth, and survival rates. Scientific evidence shows that heat stress alters metabolism, immunity, and nutrient absorption, but specific interventions—such as cooling systems, dietary adjustments, and hydration strategies—can mitigate these effects.
Heat Stress and Nutritional Disruption in Chicks
Newly hatched chicks are highly vulnerable to heat stress because their thermoregulation mechanisms are immature. During the July 2026 heatwave in France, hundreds of thousands of poultry died due to extreme temperatures exceeding 40°C. Heat stress reduces feed intake, alters digestive enzyme activity, and increases water consumption, leading to nutrient imbalances. Studies confirm that heat stress shifts metabolism from anabolic (growth-promoting) to catabolic (energy-wasting) processes, impairing protein deposition and muscle development1.
Physiological and Metabolic Effects
Heat stress elevates respiratory rate and panting, which causes respiratory alkalosis and reduced calcium absorption, critical for bone development in chicks. It also triggers oxidative stress, increasing reactive oxygen species that damage intestinal tissues and reduce nutrient absorption. The hypothalamic-pituitary-adrenal axis becomes overactivated, raising corticosterone levels that suppress appetite and immunity. These changes explain why chicks exposed to prolonged heatwaves show slower growth, weaker immunity, and higher mortality rates2.
Nutritional Strategies to Counteract Heat Stress
Scientific reviews recommend several dietary interventions to mitigate heat stress in chicks:
